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Old 20 April 2019, 16:19   #1
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Oxalic Acid mix recipe - rust removal, GRP cleaning

I've used oxalic acid in a mix for cleaning over the years but was never very particular about mixes and so on. I was a bit more scientific this season and kept a record. Cleans rust stains and returns yellowed and stained GRP to original colour in 10-15 mins, washes off with a light pressure wash.

1 litre of luke warm water
200g Oxalic acid powder (ebay)
50mls car wash detergent (any mild liquid detergent)
Wallpaper paste powder (to required consistency)

Add the acid to the water. Slowly add paste powder until mix starts to gel. Go short and leave it a while - it thickens for a few minutes. Then add detergent. Brush on, leave 10-15 mins and pressure wash off. Avoid galvanised metals, chrome etc. Wear PPE. Safe on stainless steel. Above mix will cope with a 5-6m RIB hull and console. If staining is heavy, or there is residual grime, rub gently with a rough cloth or other textured but soft material and the detergent will help lift the crud and let the acid go to work.
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Old 22 April 2019, 02:49   #2
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Does it work any better than Y10 or Hempel Gel Coat Cleaning Powder
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Old 22 April 2019, 02:55   #3
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Y10 is basically just the same, itís just 100 times more expensive!
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Old 22 April 2019, 03:41   #4
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Y10 is basically just the same, itís just 100 times more expensive!
Should have known this before ..
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Old 22 April 2019, 04:11   #5
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Is it ok to use on tubes that are only a couple of years old,or is it best on old very badly stained tubes? Iíve read so cleaners are very aggressive and take layers of hypalon off. For this reason would I be better using a milder cleaner than acid? Was told by manafactuer tubes if looked after should last 20 years hence donít want to start removing layers in the early years.
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Old 22 April 2019, 05:15   #6
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Does it work any better than Y10 or Hempel Gel Coat Cleaning Powder
Same active ingredient - only the concentrations vary. I suspect that 20% is fairly high by commercial standards. This mix removes yellowing from GRP in a minute or so and deals with rust stains very rapidly. I'd suggest a gentle brush around the worst rust - like a bolt head or crevice.

I've never noticed it have an effect on tubes where there was local splashing. I can't say it wouldn't cause discoloration because I just don't know. It is more of a bleaching agent/rust remover than a cleaner, hence my addition of detergent to shift basic grime while working.

And yes - very cheap. Apparently, having an affinity for cheap cleaning products is one of the primary tells for Scottish Ancestry.

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Old 22 April 2019, 07:01   #7
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Most marine cleaning products are based on readily available common ingredients with the addition of some very expensive water and occasionally colours or thickening agent (hence the wallpaper paste) its pretty easy to find out whats in each product as the manufacturer has by law to produce a chemical data sheet and most publish online often somewhere spurious you just search for the product name and MSDS and usually it pops up. I have noticed though that certain countries alowed the details to be a bit vague (to protect the products identity) but other countries are obviously more strict and require more specific data.
I found the data sheet for rydlyme which is weak hydrochloric acid which is clearly identified on the Australian msds sheet but not on the US data sheet.
Barnacle buster is phosphoric acid grunt is phosphoric acid y10 is oxcalic acid all of which can be bought off ebay for a fraction of the cost of the "marine" stuff
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Old 22 April 2019, 09:04   #8
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well done for putting the recipie up ,personally i skip the wallpaper paste and go with the garden sprayer ,seems to virtually work on contact , also use to rejuvinate the hardwood decking this time of year
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Old 22 April 2019, 09:20   #9
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well done for putting the recipie up ,personally i skip the wallpaper paste and go with the garden sprayer ,seems to virtually work on contact , also use to rejuvinate the hardwood decking this time of year
Bit aggressive on a galv trailer for my liking.
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Old 22 April 2019, 16:54   #10
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Bit aggressive on a galv trailer for my liking.
Have you noticed any lasting effects on trailer or other metal ?? ,personally i have got all gloved up as the word acid makes it seem like its needed ,treated it with extreme care ,but tbh have never really seen any negative effects ,be interesting to see some potetial consequences, as never seems to be too many warnings, even on the manufacturers packaging .
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